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Key to Brassicaceae, Key C: plants in fruit, trichomes of plant absent or, if present, unbranched

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1 Fruits silicles (< 3× as long as wide).
..2 Fruits 2-segmented
....3 Plants succulent, leaves usually fleshy
....3 Plants herbaceous, not succulent, leaves not fleshy
..2 Fruits unsegmented.
......4 Fruits 2 cm or more wide
......4 Fruits < 2 cm wide.
........5 Fruits with 20 or more seeds
........5 Fruits with 16 or fewer seeds.
..........6 Fruits with 1 seed.
............ 7 Plants > 5 dm tall
............ 7 Plants < 5 dm tall
..........6 Fruits with 2-16 seeds.
............ ..8 Fruits with 2 seeds
............ ..8 Fruits with more than 2 seeds.
............ ....9 Leaves pinnately lobed
............ ......10 Stems 5-12 (-20) dm tall; leaf blades of basal leaves (3-) 5-12 (-17) cm long
............ ......10 Stems 0.5-1.5 (-2) dm tall; leaf blades of basal leaves 0.3-1.5 (-2) cm long
............ ....9 Leaves not lobed.
............ ........11 Plants not fetid; seeds usually smooth, yellowish to medium brown
............ ........11 Plants fetid; seeds striate or alveolate, dark gray to dark brown or black
1 Fruits siliques (> 3× as long as wide).
............ ..........12 Fruits indehiscent or breaking into 1-seeded segments.
............ ............ 13 Fruits not segmented, 1-seeded
............ ............ 13 Fruits segmented, usually more than 1-seeded.
............ ............ ..14 Styles obsolete; plants glabrous; [coastal]
............ ............ ..14 Styles 1-5 mm; plants pubescent; [inland]
............ ..........12 Fruits dehiscent, more than 1-seeded.
............ ............ ....15 Fruits segmented.
............ ............ ......16 Cauline leaf blade bases auriculate (except B. juncea); terminal silique segment seedless (rarely 1-2-seeded), conic
............ ............ ......16 Cauline leaf blade bases not auriculate; terminal silique segment 1-5-seeded (sometimes 0).
............ ............ ........17 Fruit valves 1-veined
............ ............ ........17 Fruit valves 3-7-veined.
............ ............ ..........18 Valves of the fruit 3 (-5) veined
............ ............ ..........18 Valves of the fruit 3-5 (-7) veined.
............ ............ ............ 19 Terminal segment of fruit linear 0.1-1.6 cm long, seedless or 1-seeded.
............ ............ ............ 19 Terminal segment of fruit ensiform (flattened and 2-edged), (1-) 1.5-2.5 (-3) cm long, seedless
............ ............ ....15 Fruits unsegmented.
............ ............ ............ ..20 Fruits (all, or at least some) solitary, borne on scapes
............ ............ ............ ..20 Fruits in racemes (or corymbose clusters).
............ ............ ............ ....21 Fruits latiseptate (flattened parallel to the septum).
............ ............ ............ ......22 Replums strongly flattened; fruit valves dehiscing elastically, coiled
............ ............ ............ ......22 Replums terete or rounded; fruit valves not dehiscing elastically or coiled.
............ ............ ............ ........23 Seeds not winged.
............ ............ ............ ..........24 Fruit stipitate; cauline leaves entire, not auriculate; flowers pink to purple (or white in Warea carteri), [natives of sandhills and coastal plain, NC to s. MS]
............ ............ ............ ..........24 Fruit sessile or short-stipitate; cauline leaves usually lobed or at least dentate, the bases auriculate or somewhat clasping; flowers yellow; [non-natives, widespread]
............ ............ ............ ........23 Seeds winged at least distally.
............ ............ ............ ............ 25 Cauline leaves pinnatifid or pinnatisect
............ ............ ............ ............ 25 Cauline leaves entire or dentate
............ ............ ............ ....21 Fruits terete or 4-angled.
............ ............ ............ ............ ..26 Plants aquatic or semi-aquatic; rooting at nodes
............ ............ ............ ............ ..26 Plants terrestrial, though rarely growing partially submersed; not rooting at nodes.
............ ............ ............ ............ ....27 Fresh leaves smelling of garlic when crushed, reniform or cordate, dentate
............ ............ ............ ............ ....27 Fresh leaves not smelling of garlic when crush, rarely reniform or cordate, dentate or not.
............ ............ ............ ............ ......28 Seeds biseriate
............ ............ ............ ............ ......28 Seeds uniseriate.
............ ............ ............ ............ ........29 Stigma lobes obviously decurrent
............ ............ ............ ............ ........29 Stigma lobes sometimes distinct but not decurrent.
............ ............ ............ ............ ..........30 Lower cauline leaves entire or dentate.
............ ............ ............ ............ ............ 31 Cauline leaves spaced, not concealing stem, spreading to slightly ascending; petals 7-12 mm long
............ ............ ............ ............ ............ ..32 Basal leaves obovate to oblanceolate, unlobed; cauline leaves entire; siliques 8-13 cm long
............ ............ ............ ............ ............ ..32 Basal leaves incised or lyrate-lobed; cauline leaves with dentate to serrate margins; siliques 2-4 cm long
............ ............ ............ ............ ............ 31 Cauline leaves usually ascendant and concealing stems (at least basally); petals 2-5 mm long (except for 5-10 mm long in B. missouriensis)
............ ............ ............ ............ ..........30 Lower cauline leaves pinnatifid or pinnatisect.
............ ............ ............ ............ ............ ....33 Terminal leaflet lobes nearly entire to crenate or undulate
............ ............ ............ ............ ............ ....33 Terminal leaflet lobes sharply toothed or cut
............ ............ ............ ............ ............ ......34 Basal leaves usually withered by flowering; cauline leaf lobes entire to lyrately lobed; usually petals white to pink; [native of riparian habitats]
............ ............ ............ ............ ............ ......34 Basal leaves usually present at flowering or after; cauline leaves with linear, filiform, lyrate, or runcinate lobes (occasionally unlobed, but if so then leaves usually linear or otherwise thin); petals yellow; [non-natives of various habitats]
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